I feel compelled to point out that FreeBSD manual page for the led driver has this example:

  /usr/bin/morse -l "Soekris rocks" > /dev/led/error

Guess what it does :-)

And are you reading that visually in Morse code? I would have thought a different/more optimized flashing pattern that required a smartphone to read would be faster, especially if we're talking IPv6 addresses, but that's just me.

That was the part that really jumped out at me as well. I've had the same problem before and this is a genius solution.